1.我再也抑制不住看篮球比赛的冲动。(nolonger)
Icouldnolongerresisttheurgetowatchthebasketballmatchlastnight.
2.杰克难得去老师那儿寻求帮助，他觉得自学会使自己受益更多。（Seldom）
Seldomdid/doesJackgo/turnto/askhisteacher(s)forhelp,becausehethought/thinksself-study/teachinghimselfwould/willbenefithimselfmore/give(bring)morebenefitstohim.
3.学生们难得有机会目睹那位著名的诺贝尔文学奖获得者。(Seldom)
Seldomdostudentshaveachance/anopportunitytoseethefamouswinneroftheNobelPrizeforliterature.
4.我做梦也想不到会在这次化学竞赛中获_等奖。（Little)
LittledidIdreamofbeingabletowinthefirstprizeinthischemistrycontest.
5.他从未想到自己经历十多年的努力后，终于能在激烈的竞争中脱颖而出，并赢得这么多的掌声和鼓励。(Never…)
Neverdiditoccurtohimthathecouldstandoutinthefiercecompetitionandwinsomuchapplauseandencouragementafterovertenyearsofhardwork.
6.任何情况下父母都不能强迫孩子去做超出他们能力范围的事情。(circumstances)
Undernocircumstancescanparentsforcetheirkidstodowhatisbeyondtheircapacity.
7.学校董事会没有批准这一提案，也没有做出任何解释。（nor）
Theschoolboarddidnotapprovetheproposal,nordidtheymakeanexplanation.
8.他生来就有残疾，但从不沮丧，也从未屈服于困难。(nor)
Hewasdisabledfrombirth,butheneverfeltfrustrated,nordidheevergiveintoanydifficulty.
Although/Though/Whilehewasdisabledfrombirth,heneverfeltfrustrated,nordidheevergiveintoanydifficulty.
9.垃圾分类不仅有助于环境保护还有利于废物循环利用，所以人人要行动起来。（Notonly)
Notonlydoesclassifying/sortingrubbishhelpprotecttheenvironment,butalsoithelpsrecyclewastematerials,soeveryoneshouldtakeaction.
10.志愿者活动不仅能使青少年学到如何帮助残疾人，还可以提高他们与陌生人合作的意识。（Notonly...）
Notonlycanvolunteeractivitiesenableteenagerstolearnhowtohelpthedisabled,buttheycanalsoraiseteenagers’awarenesstocooperatewithstrangers.
Notonlycanvolunteeractivitiesmaketeenagerslearnhowtohelpthedisabled,buttheycanraiseteenagers’awarenesstocooperatewithstrangersaswell.
11.中外游客们不仅领略了古城的美景，也对当地的传统文化和悠久历史有了一个大致的了解。(Notonly)
Notonlydidthevisitorsfromhomeandabroadappreciatethebeautyoftheancientcity,butalsohadaroughideaofthelocaltraditionalcultureandthelonghistory.
12.不但政府应该制定政策防止进一步污染，而且每个公民都该责无旁贷地保护环境。(Notonly)
Notonlyshouldthegovernmentmakepoliciestopreventfurtherpollution,butalsoeverycitizenshouldtakefullresponsibilityforprotectingtheenvironment.
13.只有充分利用你遇到的每个机会，你才能实现自己的梦想。（Only)
Onlybymakingfulluseofeverychancethatyoucomeacrosscanyourealizeyourdream.
14.整个团队只有互相配合才能按时完成这项任务。（Only）
Onlybycooperatingwitheachothercanthewholeteamfinishthistaskontime/schedule/punctually.
15.只有自己愿意投身其中你才能做好你正在做的事情。（Only)
Onlywhenyouwilldevoteyourselftowhatyouaredoingcanyoudoitwell.
16.只有当他亲眼看见那些贴满小区的海报时，才真正相信中国诗词大赛是多么受欢迎。(Only)
Onlywhenhesawtheposterswhichwerestuck/putup/pasted/postedeverywhereinthecommunity/neighbourhoodwithhisowneyesdidhetruly/reallybelievethattheChinesePoetryContest/Competitionwasverypopular/greatly/particularly/warmly/enthusiastically/broadly/highly/very/welcomed.
Onlyifpartiesconcernedpaymoreattentiontotheyoungergenerationwillteenagersformpropervalues.
18.他伤得很严重，应该马上送医院。(So...)
Sobadlywashewounded/hurtthatheshouldbesenttohospitalimmediately.
19.手机在人们日常生活中起着如此重要的作用，没有人敢不带手机去旅行。（So...)
Soimportantarole/partdoesthemobilephone/domobilephonesplayinpeople’sdailylifethatnoonedarestotravelwithoutit.